Tone wheel



FIG. 1 is a front perspective view of a tone wheel, showing my new design;

FIG. 2 is rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof; the right side being a mirror image; and

FIG. 5 is a rear view thereof; and,

FIG. 6 is a right side cross-sectional view taken in the direction of line 6-6 of FIG. 3.

The broken lines illustrate portions of the tone wheel that form no part of the claimed design. 

CLAIM The ornamental design for a tone wheel, as shown and described. 